Specification Part 3 - Road & Bridge Works - Urban Administration ...

Loss in Weight,
%., Maximum
Increase in
Softening Point,
°C,
Maximum
Reduction in
Penetration at
25°C,
%, Maximum
Elastic
Recovery of
Half Thread in
1.0 1.0 1.0 IS:9382-
1979
7 6 5 IS:1205-
1978
35 35 35 IS:1203-
1978
60 40 35 ASTM
* Relevant to snow bound cold climate areas
** Natural Rubber Modified Bitumen
on site then tests shall be carried out daily. If pre-blended modified binder is used tests shall be
carried out weekly.
521.5.2. Storage Stability:
(i)Pre-blended modified binders which are to be stored without circulation or agitation facility shall
be tested for storage stability prior to use, in accordance with Appendix 1 of IRC:SP:53 - 1999.
The mean of the differences in softening point, top to bottom, of
TABLE 500-45.
REQUIREMENTS OF POLYMER MODIFIED BINDERS
(PLASTOMERIC THERMOPLASTICS)
Grade and Requirements
Designation
Method of Test
PMB 120 PMB 70 PMB40
Penetration at 25°C, 0.lmm, l00g, 5 sec. 90 to 150 50 to 89 30 to 49 IS:1203-1978
Penetration at 4°C, 0.lmm, 200g,
60 sec.. Minimum*
35 22 18 IS:1205-1978
Softening Point, (R&B), °C, Minimum 38 48 59 IS:1205-1978
Fraass Breaking Point, °C, Maximum * -20 -15 -10 IS:9381-1978
Ductility at 27°C, cm, Minimum 50 40 30 IS:1208-1978
Flash Point, COC, °C, Minimum 220 220 220 IS:1209-1978
Elastic Recovery of Half Thread in
Ductilometer at 15°C, %, Minimum 60 50 40
Separation, Difference in Softening
Point, R&B, °C, Maximum 3 3 3
Viscosity at 150°C, Poise
Test on Thin Film Oven Test Residue, TFOT (9382-1979)
Designation
ASTM
D5976-1996
ASTM
D5976-1996
1-2 2-4 4-8 IS:1206-1978
Grade and Requirements
PMB 120 PMB 70 PMB40
Method of Test
Penetration at 4°C, 0. 1mm, 200g,
60 sec., Minimum* 18 15 12 IS:1203-1978
Loss in Weight, %, Maximum 1.0 1.0 1.0 IS:9382-1979